Spelling suggestions: "subject:"microstructure"" "subject:"icrostructure""
931 |
Moessbauer spectroscopic studies of the magnetic and structural properties of novel nanophase magnetic materialsMilford, Gabrielle Helen January 2000 (has links)
No description available.
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932 |
Reaction dynamics of small molecules at metal surfacesSamson, Paul Anthony January 1999 (has links)
No description available.
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933 |
Ion scattering studies of the surface and near surface region of metals and semiconductorsDixon, Richard John January 1998 (has links)
No description available.
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934 |
The dissolution of Ag(111) electrodes investigated by in situ scanning tunnelling microscopyWilson, Tony Keith January 1998 (has links)
No description available.
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935 |
Structural and spectroscopic studies of surfaces on the nanometre scaleFesty, Frederic January 2000 (has links)
No description available.
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936 |
A study on magnetic anisotropy induced in the HDDR processFujita, Akira January 1999 (has links)
No description available.
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937 |
The chemical and magnetic structures of rare earth alloys and superlatticesClegg, Paul S. January 2000 (has links)
No description available.
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938 |
Mesoscale modelling of processing toughened polymersPorfyrakis, Kyriakos January 2000 (has links)
No description available.
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939 |
Deposition and interface modification of thin magnetic multilayer films by closed-field unbalanced magnetron sputteringOrmston, Marcus Winston January 2000 (has links)
No description available.
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940 |
Microstructural Strengthening Mechanisms in Micro-truss Periodic Cellular MetalsBouwhuis, Brandon 01 March 2010 (has links)
This thesis investigates the effect of microstructural strengthening mechanisms on the overall mechanical performance of micro-truss periodic cellular metals (PCMs). Prior to the author’s work, the primary design considerations of micro-truss PCMs had been topological issues, i.e. the architectural arrangement of the load-supporting ligaments. Very little attention had been given to investigate the influence of microstructural effects within the cellular ligaments. Of the four broad categories of strengthening mechanisms in metals, only solute and second phase strengthening had previously been used in micro-trusses; the potential for strengthening micro-truss materials by work-hardening or grain size reduction had not been addressed.
In order to utilize these strengthening mechanisms in micro-truss PCMs, two issues needed to be addressed. First, the deformation-forming method used to produce the micro-trusses was analyzed in order to map the fabrication-induced (in-situ) strain as well as the range of architectures that could be reached. Second, a new compression testing method was developed to simulate the properties of the micro-truss as part of a common functional form, i.e. as the core of a light-weight sandwich panel, and test the effectiveness of microstructural strengthening mechanisms without the influence of typical high-temperature sandwich panel joining processes, such as brazing.
The first strengthening mechanism was achieved by controlling the distribution of plastic strain imparted to the micro-truss struts during fabrication. It was shown that this strain energy can lead to a factor of three increase in compressive strength without an associated weight penalty. An analytical model for the critical inelastic buckling stress of the micro-truss struts during uniaxial compression was developed in terms of the axial flow stress during stretch forming fabrication. The second mechanism was achieved by electrodeposition of a high-strength nanocrystalline metal sleeve around the cellular ligaments, producing new types of hybrid nanocrystalline cellular metals. It was shown that despite the added mass, the nanocrystalline sleeves could increase the weight-specific strength of micro-truss hybrids. An isostrain model was developed based on the theoretical behaviour of a nanocrystalline metal tube network in order to predict the compressive strength of the hybrid materials.
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